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#1 2005-09-06 09:05:48
- the_white_sheep
- Novice
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Simultaneous equation: Some please help me!
Hi
I know this may look easy for some people but I'm just grasping it. Please look at the following simultaneous equation and see what you get. Thanks alot.
3p + 2q = 9
4p - 6q = 25
Please let me know how you worked it out as well.
Thanks
Hozan
#2 2005-09-06 09:35:11
- John E. Franklin
- Star Member
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Re: Simultaneous equation: Some please help me!
Compare 3p and 4p. Okay. Then compare 2q and -6q. Oh, 2 times 3 is 6, so that will be the easy way to solve.
We will get rid of the q and find p. Multiply 3p +2q = 9 by 3 and add it to the other equation.
So 9p + 6q = 27. Add it to second equation. 13p + zero q = 52
p = 4. Put 4 back into any equation and get q. q = -3/2
Another way is to graph the two lines on graph paper and see where they intersect.
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